1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/ata/libata-zpodd.c b/drivers/ata/libata-zpodd.c
index 27eed2f09a8a..9a0d90d09d81 100644
--- a/drivers/ata/libata-zpodd.c
+++ b/drivers/ata/libata-zpodd.c
@@ -1,5 +1,7 @@
 #include <linux/libata.h>
 #include <linux/cdrom.h>
+#include <linux/pm_runtime.h>
+#include <scsi/scsi_device.h>
 
 #include "libata.h"
 
@@ -12,6 +14,10 @@ enum odd_mech_type {
 struct zpodd {
         enum odd_mech_type      mech_type; /* init during probe, RO afterwards */
         struct ata_device       *dev;
+
+        /* The following fields are synchronized by PM core. */
+        bool                    from_notify; /* resumed as a result of
+                                              * acpi wake notification */
 };
 
 /* Per the spec, only slot type and drawer type ODD can be supported */
@@ -68,6 +74,32 @@ static bool odd_can_poweroff(struct ata_device *ata_dev)
         return acpi_device_can_poweroff(acpi_dev);
 }
 
+static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context)
+{
+        struct ata_device *ata_dev = context;
+        struct zpodd *zpodd = ata_dev->zpodd;
+        struct device *dev = &ata_dev->sdev->sdev_gendev;
+
+        if (event == ACPI_NOTIFY_DEVICE_WAKE && ata_dev &&
+                        pm_runtime_suspended(dev)) {
+                zpodd->from_notify = true;
+                pm_runtime_resume(dev);
+        }
+}
+
+static void ata_acpi_add_pm_notifier(struct ata_device *dev)
+{
+        acpi_handle handle = ata_dev_acpi_handle(dev);
+        acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+                                    zpodd_wake_dev, dev);
+}
+
+static void ata_acpi_remove_pm_notifier(struct ata_device *dev)
+{
+        acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->sdev->sdev_gendev);
+        acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, zpodd_wake_dev);
+}
+
 void zpodd_init(struct ata_device *dev)
 {
         enum odd_mech_type mech_type;
@@ -89,12 +121,14 @@ void zpodd_init(struct ata_device *dev)
 
         zpodd->mech_type = mech_type;
 
+        ata_acpi_add_pm_notifier(dev);
         zpodd->dev = dev;
         dev->zpodd = zpodd;
 }
 
 void zpodd_exit(struct ata_device *dev)
 {
+        ata_acpi_remove_pm_notifier(dev);
         kfree(dev->zpodd);
         dev->zpodd = NULL;
 }